Microsoft's Connected Experience APIs let Windows apps integrate deeply into the OS for better discovery, engagement, and cross-device continuity. Two main features are covered: Windows Resume, which surfaces a taskbar badge when a user's mobile activity (e.g., Spotify, WhatsApp) can be continued on PC — even driving app installs if not already present — and the People API, which lets apps donate contacts to appear in Windows widgets, search, and share sheet with ranked relevance. Resume supports two integration paths: the Continuity SDK (Android, Bluetooth proximity, supports install flow) and Windows Notification Service/WNS (cloud-driven, any platform, requires app already installed). The People API involves creating a user data account, storing contacts with system-only access, enriching them with communication URI annotations (message, call, video), and donating interaction signals for ranking. Both APIs are designed with user privacy controls built in.